Go + App Engine数据存储区：如何过滤出为空的行？
问题描述：
How do I filter out rows that are null? I know it's hard to find only-null rows, but hopefully this should be easier.
I'd like to do the following:
q := datastore.NewQuery("MY_KIND").Filter("MY_ID !=", nil)
... but Filter doesn't support the != comparator. FYI, using this GQL syntax in the Datastore Viewer works just fine:
SELECT * FROM MY_KIND WHERE MY_ID != NULL
如何过滤掉为空的行？ 我知道很难找到仅空的行，但是希望这会更容易。 p>
我想执行以下操作： p>
q：= datastore.NewQuery（“ MY_KIND”）。Filter（“ MY_ID！=”，nil） code> pre>...但不支持Filter ！=比较器。 仅供参考，在Datastore Viewer中使用此GQL语法可以正常工作： p>
SELECT * FROM MY_KIND WHERE MY_ID！= NULL code> pre>
答
You can use greater filter with the appropriate value (> 0 for numbers, > "" for strings).
Typically an ID cannot be an empty string or zero.